Temporal Adept does not have summoning sickness.

Activate Temporal Adept by paying and tapping it, returning The One Ring from the battlefield to your hand.
Cast The One Ring by paying .
The One Ring triggers, giving you protection from everything until your next turn.
Repeat each turn.

Temporal Adept does not have summoning sickness.

Activate Scroll of Fate by tapping it, manifesting Wormfang Manta from your hand.
Pay to turn Wormfang Manta face up.
Activate Temporal Adept by paying and tapping it, returning Wormfang Manta from the battlefield to your hand.
Wormfang Manta's LTB ability triggers, creating an extra turn after this one.
Repeat each turn.